Question

What is added to ferric chloride to get ions of acetic acid?

Answer 1

Hello everyone...

Ferric ions can be hydrolysed and precipitated as ferric hydroxide at pH >4.5. Poor coagulation occurs in the pH range between 7 and 8.5. The ferric ion (like the aluminium ion) hydrolyses to form hydrates and an acid. Enough alkalinity must be present to combine with the acid and maintain a suitable pH for good coagulation. Unlike Al(OH)3, ferric hydroxide does not redissolve in alkaline solutions, and so there is no particular upper pH limit for ferric coagulation. In addition, the ferric hydroxide floc is usually heavier, and hence faster settling, than the aluminium hydroxide floc.

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